Air-compressor



M. DILLENBURG.

AIR COMPRESSOR.

Patented Aug. 30, 1892.

IMI."-

I V x (No Model.)

i cylindrical sleeve B, which fits the interior NITED STATEsP-ATLENTOFFICE.

MICHEL DILLENBURG, OFSAN FRANCISCO, CALIFORNIA.

Am-cpomrREssogn.

SPECIFICATION forming part of Letters Patent No. 481,850, dated August30, 1892.

Application filed April 17', 1891.

To all whom it may concern:

Be it known that I, MICHEL DILLENBURG, a citizen of the United States,residing in the city and county of San Francisco, State of California,have invented an Improvement in Air-Compressors; and I hereby declarethe following to be a full, clear, and exact descrip tion of the same.

My invention relates to certain improvements in apparatus forcompressing air'and other elastic fluids; and .it consists of theconstruction and combination of devices hereinafter fully described andclaimed.

The figure is a vertical section taken longitudinally through thecylinder, piston, and valve.

A is the compressing-cylinder havingthe piston B, adapted to reciprocatewithin it, said piston having suitable packing rings; and means formaking a tight joint.

0 is the piston-rod, which passes out through a stuffing-box in thelower head D of the cylinder, and E is the inlet-passage, through whichthe elastic fluid is admitted to the lower part of the cylinder. Thepiston-rod is connected with a slide and a crank or other means wherebyit is caused to reciprocate within the cylinder. The upper end of thepiston-rod has formed upon or fixed to it a valve G, the upper peripheryof which is beveled or made conical, and it fits a corresponding beveledseat H in the upper part of the piston, closing upwardly. The piston-rodextends through the web of the piston and is movable longitudinallytherein. The outer of the cylinder, is secured to the web in thefollowing manner: The inner face of this sleeve has a groove or channelturned in it, and the lower end of the web or body is turned down atthis point to correspond with the channel. A ring B being placed in thisgroove or channel, half of it extends into the groove in the sleeve, andthe piston-body slips over the inwardly-projecting part of the ring,thus locking the two together, but permitting of their being easilyseparated when desired. The construction provides against the permanentlocking of the web with the sleeve due to any corrosion at the point oflocking. By raising the piston-body against the pressure Serial lTo.389,357- (No model.)

of; the spring until the ringis exposed below its lower end the ring maybe removed from the groove in the outer sleeve and the parts separated.The web B is made in the form of 'a spider or having openings I passingthrough it fromend to end to allow the air to flow through the pistonwhen the latter is drawn down toward the lower end of the cylinder.

Below the valve G at the upper end of the piston-rod is a guiding collaror flange J, which moves and is guided in a central chamber in the webB, this chamber being bored out of sufiicient diameter to allow theguide-flange to slip easily in the upper part. By thus closely arrangingthe collar or flangeJ within the upper end of the chamber a securebearing is formed for the upper end of the piston-rod, and as the saidrod passes closely through the central opening in the lower end .of thepiston a similar bearing is formed at this point. Therefore thepiston-rod is securely braced and reinforced at the two points noted,which are recognized as the places subjected to the greatest strain.Within this chamber "is contained astout spiral spring K, which pressesagainst the flange J and under ordinary normal conditions forces thevalve G upward against the seat H of the outer ring B of the piston,thus closing this opening.

In the upper end of the cylinder is avalve L, suitably guided andclosing upon a seat formed for it in this chamber. When the piston isforced up, the valve G closes, as before described, against the seat Hin the piston, and any air which is above the piston is forced out intothe chamber above and thence to the reservoir, the pressure of the airopening the valve L to allow it to pass. When the pistonrod 0 is drawndownward again by the action of the connecting-crank or other movingdevice, the pressure within the cylinder below the piston will tend toforce the piston toward the upper end of the cylinder. The piston-rodbeing drawn down against this pressure, the guiding-flange J willcompress the spring K in the central chamber of the piston and will thusdraw the valve G away from the seat 11 of the piston. This leaves aclear opening through the passages I in the piston and around the valveG between it and the seat H, so that when the piston is drawn ICOdownward the air will flow freely through the piston and pass above thevalve and there will be no pressure of air necessary to open the valve,because this operation is mechanically peformed by drawing down thepistonrod and valve, as before described. This is of considerableimportance Where the air or other elastic vapor is at all attenuated.hen the piston has reached the bottom of the cylinder and the spaceabove the piston is full of the elastic fluid, the first movement of thepiston-rod to return the piston to the upper end of the cylinder willclose the valve G against the seat H, and the piston-rod thereafter actsagainst the valve and through it against the piston, forcing the wholeto the upper end of the cylinder and discharging the air or otherflnidinto the space above the valve L, opening the latter, as beforedescribed. In addition to this mechanical opening of the valve, on thedownstroke of the piston I am enabled to prevent any damage to thecylinder by reason of the breaking of the valve, because the valve iscontained within the chamber at the upper end of the piston and isprevented from escaping from this chamber in case of breakage by reasonof the seat 11, against which it closes. This seat is of smallerdiameter than the valve, and consequently retains it within the piston,so that the apparatus may be stopped and repairs to the valve madeWithout the latter having in any wise damaged other parts of thecylinder.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

An improved air-compressor consisting of a cylinder, a piston-rod, apiston having an exterior sleeve provided with an annular groove aroundits interior near the bottom and a beveled valve-seat around itsinterior near its top, said piston having a web whose lower end issmaller than its body, a ring between the Web and sleeve and occupyingthe groove of the latter and the reduced portion of the former andserving as the means for locking the sleeve to the Web, but allowing ofthe ready separation of these parts, said web having a central openingwith openings I upon each side thereof, and a central chamber, a springin said chamber, a valve at the upper end of the piston-rod and aguide-collar on said rod below the valve, said central opening and innerwalls of the chamber serving as bearings for the piston-rod andguiding-collar, respectively, and as reinforces for theupperendofthepiston-rod,allconstructed, combined, and arranged to operatesubstantially as herein described.

In witness whereof I have hereunto set my hand.

MICHEL DILLENBURG.

lVitnesses:

S H. NOURSE, J. A. BAYLESS.

